340 in Roman numerals
CCCXL
The number 340 is written CCCXL in Roman numerals.
How CCCXL breaks down
| Symbols | Value |
|---|---|
CCC | 3 × 100 = 300 |
XL | 40 |
CCCXL | 340 |
This numeral uses the subtractive rule: a smaller symbol placed before a larger one is subtracted from it. Only six such pairs are legal — IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).
Nearby numbers
| Number | Roman numeral |
|---|---|
| 335 | CCCXXXV |
| 336 | CCCXXXVI |
| 337 | CCCXXXVII |
| 338 | CCCXXXVIII |
| 339 | CCCXXXIX |
| 340 | CCCXL |
| 341 | CCCXLI |
| 342 | CCCXLII |
| 343 | CCCXLIII |
| 344 | CCCXLIV |
| 345 | CCCXLV |
The seven symbols
I | 1 | C | 100 |
V | 5 | D | 500 |
X | 10 | M | 1,000 |
L | 50 |
340 in other notations
| Roman | CCCXL |
| Binary | 101010100 |
| Hexadecimal | 154 |
| Octal | 524 |
| Written out | three hundred and forty |
Writing it by hand
Work down through the symbol values, taking as many of each as will fit before moving to the next. For 340:
3 × C = 300 remaining: 40
XL = 40 remaining: 0The result reads CCCXL — 5 characters, against 3 digits in Arabic numerals.
Frequently asked questions
What is 340 in Roman numerals?
CCCXL
How do you read CCCXL?
Work left to right, adding each symbol — except where a smaller symbol precedes a larger one, in which case it is subtracted. CCC is 300, XL is 40, giving 340 in total.
How do you write 340 in words?
three hundred and forty.
Why is there no zero?
Roman numerals have no symbol for zero. The concept reached Europe only with Hindu-Arabic numerals, centuries after the system was in use — which is a large part of why it was eventually replaced for arithmetic.